Cheapest priced copy (Tarkir: Dragonstorm Commander): $1.99 at Card Kingdom, near mint, their price list as of .
Lord of Extinction 
Creature — Elemental · */* · Mythic · Alara Reborn · #91
Lord of Extinction's power and toughness are each equal to the number of cards in all graveyards.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
7 printings · $1.99 to $47.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Double Masters 2022 | 244 | Mythic | $2.29 | $4.49 |
| Double Masters 2022 | 518 | Mythic | — | — |
| Alara Reborn | 91 | Mythic | $3.49 | $19.99 |
| Amonkhet Invocations | 52 | Special | — | $47.99 |
| Ultimate Box Topper | U23 | Mythic | — | $13.99Out of stock |
| Tarkir: Dragonstorm Commander | 295 | Mythic | $1.99 | — |
| Ultimate Masters | 203 | Mythic | $2.49 | $5.99 |
2 rulings from Wizards of the Coast
- 7 December 2018The ability that defines Lord of Extinction's power and toughness works in all zones, not just the battlefield. If Lord of Extinction is in your graveyard, it will count itself.
- 7 December 2018If an instant or sorcery spell deals damage to Lord of Extinction or lowers its toughness, that spell is put into its owner's graveyard before state-based actions are performed. That card will raise Lord of Extinction's toughness before the game checks to see if it dies.